How to get a refund for unwanted YouTube subscription

I signed up for a YouTube premium trial and forgot about it. Seven months later I realize I’ve been paying 15.99 for no more than occasionally watching a YouTube clip available to anyone. I’d like to try for a refund but Apple is not showing any option to request a refund in request a refund- a refund for YouTube just isn’t an option. One reason may be that my subscription is through an old iCloud id which I can’t access because I’ve lost the password. Yes I feel a bit stupid for forgetting, however, the email notices we’re going to my old email address and it’s not on my phone. Doh. Any advice please?